The sample space listing the eight simple events that are possible when a couple has three children is {bbb, bbg, bgb, ogg, gbb, gbg, ggb, ggg}. After identifying the sample space for a couple having four children, find the probability of getting four girls and no boys.

Identify the sample space for a couple having four children.

(Use a comma to separate answers as needed.)

Find the probability of getting four girls and no boys.

(Type an integer or a decimal. Do not round.)